STUDY OF CHORDATE BRANCH CHARACTERISTICS 



For guidance in arriving at a correct answer, ask yourself 

 this question, ''Does this answer apply to all chordates?" If 

 it does apply, then you have a branch characteristic. 



1. The Skeleton. Of what does the endoskeleton consist? 



2. The Body. 



(1) Two Body-cavities. 



(a) The upper one, or the neural cavity, contains what 



system? 



(b) The lower one, or the hemal cavity, contains what 



systems of organs? 



3. The Paired Limbs. How many? 



4. The Notochord. Is it present in the larval or in the adult 

 stage, or in both? If it is not present in the adult stage, what has 

 become of it? Its use? 



5. The Gill-slits. When are they present, in the larval or in 

 the adult stage, or in both? If they are not present in the adult 

 stage, what has become of them? Their use? 



6. The Nervous System. 



(1) Its position in the body? 



(2) Consists of what organs? 



7. This animal belongs to Branch because it has the 



following characteristics of that branch. (Student name them.) 



STUDY OF CHORDATE CLASS CHARACTERISTICS 



1. General shape of the body of this animal? 



2. Exoskeleton or External Skeleton. Scales, feathers, hair, 

 fur, none, or what? 



3. Endoskeleton or Internal Skeleton. 



(1) Occipital Condyles — one or two? 



(2) Appendages. 



(a) Called what? 



(b) Clawed or not clawed? 



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